Write Ahead Log Page - Type 0x0a

Every database has one Write Ahead Log page (WAL) which is currently always
located at page 2.

Note

Discussions have taken place on the Firebird development mailing list on
removing this page altogether as it is not used and simply wastes space that
could be better used elsewhere. From Firebird 3.0 it is likely that there will
not be a WAL page in any new databases.